Originally Posted by Just Jeff
Should also mention that if you get one of the JRBs with a head hole, you can wear it in camp as insulation so you save the pack weight of a jacket. So while the "insulation system" isn't much lighter, your pack can be about a pound lighter.
That's why I carry the No Sniveler on every trip, no matter what else I'm using for insulation.
you can do the same with a peapod. .